/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.execution.engine.export;

import io.crate.execution.dsl.projection.WriterProjection;

import javax.annotation.Nullable;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
import java.util.zip.GZIPOutputStream;

public class OutputFile extends Output {

    private final String path;
    private final boolean overwrite;
    private final boolean compression;

    public OutputFile(URI uri, @Nullable WriterProjection.CompressionType compressionType) {
        if (uri.getHost() != null) {
            throw new IllegalArgumentException("the URI host must be defined");
        }
        this.path = uri.getPath();
        compression = compressionType != null;
        this.overwrite = true;
    }

    @Override
    public OutputStream acquireOutputStream() throws IOException {
        File outFile = new File(path);
        if (outFile.exists()) {
            if (!overwrite) {
                throw new IOException("File exists: " + path);
            }
            if (outFile.isDirectory()) {
                throw new IOException("Output path is a directory: " + path);
            }
        }
        OutputStream os = new FileOutputStream(outFile);
        if (compression) {
            os = new GZIPOutputStream(os);
        }
        return new BufferedOutputStream(os);
    }
}
